Expanding arbor



Feb.,4, 1930. w, J.'DENNING 1,745,559

- EXPANDING ARBOR Filed Dec. 1928 lllfllll II M 1/11,

IN VEN TOR.

. ATTORNEY Patented Fel 4, 1930 srATEs PATENT- oFFics WILLIAM .J-

i lIL IBT 3v QEC ICA Q, L IN IS, S I Q NBAD N TOO C I EA STY QF QHIQAG-QL LLINQI A C RP RATION OF ILL nzgimnmne ARBOR 7 Application filed DeeemberWG, 1928. Serial No. 324,282.

invention relates to boring tools and to the reaming of holes has special reference toexactsizes. v i a More particularly'the invention relates to an expanding reamer and mandreL.

Oneinup omntobj ect of the invention is to provide an improved arrangement of:

reamer wherein ashellreamer having fixed blades may be used on an expanding mandrel lo and be itself expandedby the expansion of said mandrel,

A secondimportant object of theinvention 18113.0 provide an expansionshell reamer cap-H able of use in connection-with an expansion mandrel of standard dimensions, the mandrel acting as the expansion member ion-the rearner.w 3 a A third important object of the. invention is to; provide a novel arrangement of expand, 20. ingwmandrel and expanding shell reamer for use therewith wherein thereamer is prevent; ed' from rotationrelative; to the mandrel by interengaging means on the reamer and man dreL. I

With the above and: other objects in view as: will behereinafzter. apparen the nv n tion' consists general of certain novel dewas or construction and cembin tionof parts hereinafterfully described, i lus rated inthe aceoinpanying; drawings and specifie callyiclaimed;

In the accompanying drawings like characr parts in I the ters of reference indicate like sevenal'views, and: I 35. .Figure 1 is a sideelevation of the learner and mandrel assembled. Figure :2 is .an-uend view thereof.

' dis a section on the'line 3.,3 oi Figure 2. i

' igure a is'awsectionl on the ine o Figure-1. 1 I 1 Intherenstrnc ien otthe in e tion in t e. forth herein disclosed showing: one type, beenillustramd as a shank mandrelt From the drawings t ill be seen,

that-this mandrel as; a cylindrical hedy' 0.

from one end or? wh ch p oj cts a apered shank-11 or standard tapen Fra c the other endc the hedy there prot cts a. reduced cy se liridriealzpert en 1.2:hatedhr1e: evideamulethe mandr l has as:

lar extremity open at its free end. The wall of the cylindrical tubular portion is slotted from its'free end through the wall back to the bottom of the tube, the slots being shown at 13. Internally the inner end of this tubular; portion is screw threaded and the outer or open end is tapered to receive a tapered plug 1i having its innerend 15 threaded to screw into the threaded end of the tube. The outer end of this plug is provided with a wrench square 16 so that the screwing in of this plug may be accomplished and thus the mandrel expanded.

Fitting on the portion 12 is a shell reamer having a cast alloy body 17 in which are held the blades 18 projecting at one. end to form a face reamer and terminating short of the other end of the body. Around the last mentioned end of the body is fitted a steel band '19; and in this end, under the band, are

formed notches 20 which engage, pins 21 on the part 12 so as to keep the reamer from roa tating when in position for use. The other,

or face end of the body is provided with slits 22 between the blades and these slits are preferably arranged out of alinement with the slits in the part 12.,

In use the reamer is slipped, on the part 12 and the mandrel expanded just sufficiently arbor has other utilities than its use in con nection with an expansion shell reamer. In

machine shop practice cases arise, in machining where it is necessary to hold a reamer rigidly on the arbor or mandrel due to the nature of the set-up and the work to be done.

In such cases it is common to drill and tap a hole in a standard arbor, place the shell reameron the arbor and screw a bolt carrying washers to bear against the end of the shell reamer into the tappedhole. When this is done it is not possible to ream to the bottom of a blind hole but by using the arbor cf the Pltflfii invent-4 .1 an rdmarr r t ll r ent r of the fixed size type may be positioned on the arbor to project beyond the end thereof and then the arbor expanded to grip the reamer firmly so that reaming may be done to the bottom of a blind hole, the arbor holding the tool firmly in place under all working conditions and preventing the reamer from pulling OE and spoiling either the work or the tool. 1

There has thus beenprovided a simple and efiicient device of the kind described and for the purpose specified. v

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, therefore desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is: p

1. In combination,,a mandrel having a tubular end provided with radially expansible sections, a shell reamer having radially expansible sections mounted on the tubular end of said mandrel, and means to efiect radial movement of said sections.

2. In combination, a mandrel having a tubular endslitted to provide radially expansible sections, a similarly slitted shell reamer mounted on thetubular end of the mandrel, and means to force said sections of the mandrel outwardly whereby to expand the reamer.

I 3. In combination, a mandrel having a body and a tubular end extending from the body and open at the end remote from the body, said tubular end having slits extending through its Wall from its open end toward the body, a shell reamer open at both ends to slide onto the tubular end of the mandrel and having slits similar to the slits of the mandrel and extending correspondingly V thereto, and means to expand the portions of the mandrel j.'between its slits radially.

4. In combination, a mandrel having a tu bular end provided with radiallyexpansible sections, a shell reamer having radially expansible sections mounted on the tubular end "of said mandrel, said tubular end of the mandrel being provided with an internally threaded portion and an adjacent tapered portion, and a tapered expansion plug fitted in said tapered portion and having at one end a threaded portion screwed into the threaded portion of the mandrel, said plug further having means for engagement by a rotating tool.

5. In combination, a mandrel having a tu-.

vided with an internally threaded portion and an adjacent tapered portion, and a tapered .body and open at the end remote from the body, said tubular end having slits extending through its wall from its open end toward the body, a shell reamer open at both ends to slide onto the tubular end of the mandrel and having slits similar to the slits of the mandrel and extending correspondingly thereto, said tubular end of the mandrel being provided with an internally threaded portion and an 7 adjacent tapered portion, and a tapered expansion plug fitted in said tapered portion and having'at one end a threaded portion screwed into the threaded portion of the mandrel, saidplug further having'means for engagement by a rotating tool.

7. In combination, a mandrel having a tubular end provided with radially expansible sections, a shell reamer having radially expansible sections mounted on the tubular end of said mandrel, means to effect radial movement of said sections, and interengaging means on the mandrel and reamer to pos1- tlvely hold the reamer agalnst rotation on the mandrel.

8. In combination, a mandrel having a tubular end slitted to provide radially expansible sections, a similarly slitted shell reamer mounted on the tubular end-of the mandrel, means to force "said sections of the mandrel outwardly whereby to expand the reamer, and interengaging' means on the mandrel and reamer to positively hold the reamer against rotation on the mandrel. T

9. In combination, a mandrel having a body and a tubular end extending from the body and open at the end remote from the body,'said tubular end having slits extending through its wall from its open end .toward the body, a shell reamer open at both ends to slide onto the tubular end of the mandrel and having slits similar to the slits of the mandrel and extending corresponding.

1y thereto, means to expand the portions of interengaging means on the-mandrel and reamer to positively hold the reamer against rotation on the mandrel. a

10. In combination, a mandrel having a tubular end provided with radially expansible sections, a shell reamer having radially expansible sections mounted on the tubular end of said mandrel, said tubular end of the mandrel being provided with'an internally threaded portion and an adjacent tapered portion, a tapered expansion plug fitted in said tapered portion and having at one end a'threaded portion screwed into'the threaded portion of the mandrel, said plug further hava I slide onto the tubular end of the mandrel .ing means for engagement by a rotating tool,

and interengaging means on the mandrel'and reamer to positively holdthe reamer against rotation on the mandrel. V

' 11. In combination, a mandrelhaving a tubular end slitted to provide radially expansible sections, a similarly slitted shell reamer mounted on the tubular end of the mandrel, said tubular end of the mandrel being provided with an internally threaded portion and an adjacent tapered portion, a

tapered expansion plug'fitted in said tapered portion and having at one end a threaded vportion screwed into. the threaded portion of themandrel, said plug further having means for engagement by a rotating tool, and interengaging means on the mandrel and I reamer to positively hold the reamer against rotation on the mandrel.

"12. In combination, a mandrel having a body and a tubular end extending from the I body and open at the end remote from the body, said tubular end having slits extending through its wall from its open end toward the body, a shell reamer open at both endsto and having slits similar to-the slits of the "mandrel and extending correspondingly thereto, said tubular end of the mandrel being provided with an internally threaded portion and an adjacent tapered portion, a tapered expansion plug fitted in said tapered portion and having at one end a threaded portion screwed into the threaded portion of the mandrel, said plug further having means for en- 1 gagement by a rotating tool, and interengag- 'ing means on the mandrel and reamer to positively hold the reamer against rotation on the mandrel.

In testimony whereof I affix my signature.

, WILLIAM J. DENNING. 

